Montezuma's Revenge or Leadville 100

I'm looking for routes up in mountains not too far from Denver which consist of challenging climbs and good scenery, perhaps portions of Montenzuma's Revenge or The Leadville 100? I enjoy long tough climbs which make one dig deep but not necessarily ridiculously technical.

Most of the climbs that the Revenge used where baby head Jeep roads that are all chewed up by jeeps, ATVs and dirt bikes. Challenging, but I'm not so sure they're all that much fun. the views from up there are spectacular though, no doubt about that.

A better bet would be something like the climb up the CT from the middle fork of the Swan to Georgia pass. The climb up the wheeler trail from Copper mountain to Wheeler pass. The climb up Little French Gulch that is part of the Firecracker course is shorter than the two ijust mentioned, but still a toughy. The Cammando run climb from Bowmans cutoff to two elks is a tough one too.

Jeep trails are ok I guess so long as you can maintain traction though I'd prefer single track. I'd like to challenge myself climbing and altitude wise. But too steep and technical and it would become a hike-a-bike. If you can give me leads on a weekend's worth of the top rides that would be great.

I could handle a ride up to 10-15 miles depending on the altitude and climbing. I'm willing to train for longer rides or high altitude if I need to. I really like vistas with views so if the altitude is high, which I'm cool with, I just need to make sure technical difficulty isn't mixed in with too much steepness.